The service offered by telephone companies allowing creating the telephone numbers on the same line where the existing number is. The call tone for every number will be different from another. There is also an opportunity to program a custom ring tone for the incoming call.
Solution de téléphonie IP / VOIP Forfait illimité fixe et mobile en France et en Europe, Forfaits 100% illimités vers tous les opérateurs 24h/24 et 7j/7.